Finding the Fourth Proportional to 1,200.25, 1,656.35 and 648.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.25 : 1,656.35 = 648.25 : x
2. Step 2: Convert to fraction form
   1,200.25/1,656.35 = 648.25/x
3. Step 3: Cross multiply
   1,200.25x = 1,656.35 × 648.25
4. Step 4: Simplify right side
   1,200.25x = 1,073,725.65
5. Step 5: Solve for x
   x = 1,073,725.65/1,200.25
6. Step 6: Final answer
   x = 894.59